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I have a 2011 MBP which i bought with a faulty screen to use with an external monitor / TV which has all been fine until today. After seeing the upgrade to high sierra reminder everyday and ignoring it i thought i might as well give it a look and told it to go ahead without thinking about the display issue. After the initial restart all i get is a grey no entry sign on my external hdmi display and nothing i do will change that, I tried booting in safe mode by holding the shift key down but with the display open i don't get anything on the TV so no idea whats happening on the broken screen. I tried hitting shift on a wired keyboard after hitting the power button and quickly shutting the lid but again nothing. only if i hit the button and close the lid i get the TV on wight he grey no entry logo. So it looks like i killed my perfectly working laptop in no time. Any advise greatly appreciated.

  • The external screen is unrelated to your problem. The issue is that your MBP will not boot after HS upgrade. See this post: apple.stackexchange.com/questions/317149/… – Allan Mar 31 '18 at 12:59
  • Thanks, I just tried a pram reset etc with the lid down and it has booted and is continuing the install to HS, I only got to the select drive and restart when i got the no entry sign so like the other post I'm not sure it would be something like a hardware issue but i will see how far i get?? saying 45mins to continue so time will tell. thanks for the post. – Tony Charlton Mar 31 '18 at 13:12
  • Looks like a general installer failure, quickest would be reinstalling and restoring from backups – John Keates Apr 1 '18 at 2:17

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